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The 1.5.4 Portable version is a specific release of KMSAuto Net 2016, created by Ratiborus, a well-known developer of KMS activation tools. The "Portable" label indicates that this version doesn't require installation and can be run directly from a USB drive or any other portable storage device.
KMSAuto Net 2016 is a popular tool used to activate Microsoft products, including Windows and Office, without the need for a genuine product key. It's a KMS (Key Management Service) emulator that mimics the behavior of a KMS host.